-90.61% is the change from 586 to 55
Calculation steps:
[( 55 - 586 ) ÷ 586] x 100 = -90.61%
Formula
Percentage change = [(55 - 586) / 586] x 100
Subtract the new number by the original number
55 - 586 = -531
-531 ÷ 586 = -0.9061433447098977
-0.9061433447098977 x 100 = -90.61%